2.0 CDI (OM640) vs 2.0/2.2 D-4D: which engine is more reliable?

According to our risk index, the 2.0 CDI (OM640) carries less risk than the 2.0/2.2 D-4D: 36/100 (moderate risk) versus 77/100 (very high risk). The 2.0 CDI (OM640) has 2 documented serious faults, the main one being «Costly failure of the Autotronic (CVT) automatic gearbox»; the 2.0/2.2 D-4D has 1 documented serious fault, the main one being «Warped cylinder head gasket and oil consumption on the 2.2 D-4D».

Risk index

2.0 CDI (OM640)

Moderate risk · 2 serious faults

Lower risk

Risk index

2.0/2.2 D-4D

Very high risk · 1 serious fault

The index (0–100) weights the severity and frequency of the three most serious documented faults. How it is calculated

Reviewed on 27 September 202619 sources How we work

Is the 2.0 CDI (OM640) reliable?

The OM640 is the 2.0 CDI four-cylinder diesel that Mercedes-Benz fitted between 2004 and 2012 to the A-Class (W169) and B-Class (W245), with outputs from 82 to 140 hp (160/180/200 CDI). Its mechanical base is considered reliable, with the EGR valve and the injectors being typical weak points of diesels of that era; the problem owners cite most, however, is the Autotronic (CVT) automatic gearbox, optional on the 180 CDI and 200 CDI.^[1][2][3][4]

See the 4 of the 2.0 CDI (OM640) faults

Is the 2.0/2.2 D-4D reliable?

No: the 2.0/2.2 D-4D family is among the most problematic Toyota diesels. The 2.2 block (2AD-FTV and 2AD-FHV D-CAT) has a large number of cases of warped cylinder head gaskets and oil consumption or dilution in the Avensis, RAV4, Auris, Corolla Verso and Verso; the EGR valve and injectors fail frequently across the whole family, and the D-CAT filter clogs up if the car is not driven regularly on open roads.^[5][6][7][8]

See the 4 of the 2.0/2.2 D-4D faults

Side-by-side comparison

Comparison of 2.0 CDI (OM640) and 2.0/2.2 D-4D
Item	2.0 CDI (OM640)	2.0/2.2 D-4D
Technical data
Type	Engine	Engine
Fuel	Diesel	Diesel
Displacement	1,991 cm³	—
Timing	Chain	Chain
Power	82–140 hp	116–177 hp
Production	2004–2012^{[1][9][10][11]}	2005–2018^{[12][13][14][15][16]}
Reliability
Risk index (what is it?)	36Moderate risk	77Very high risk
Documented faults	4	4
Of high or critical severity	2	1
Worst severity	Critical severity	Critical severity
Main faults	Critical severity: Costly failure of the Autotronic (CVT) automatic gearbox High severity: Premature turbocharger wear or failure Medium severity: EGR valve clogged with soot	Critical severity: Warped cylinder head gasket and oil consumption on the 2.2 D-4D Medium severity: EGR valve clogged with soot Medium severity: Injector wear and failure
Most expensive documented repair	No reliable data	No reliable data
Which versions to buy
BuyRecommended versions	None	None
With cautionVersions to be cautious about	160 CDI (60 kW/82 hp, A-Class only)^[2][10] 180 CDI (80 kW/109 hp)^[2][3] 200 CDI (103 kW/140 hp)^[2][4]	2.0 D-4D (1AD-FTV, 116-126 hp, 2005-2018)^[5][17]
AvoidVersions to avoid	None	2.2 D-4D (2AD-FTV, 136-150 hp, 2005-2015)^{[5][6][7][8][17][18][19]} 2.2 D-4D D-CAT (2AD-FHV, 174-177 hp, 2005-2015)^[6][17][18]

Severity of each fault: green, low; amber, medium; red, high; dark red, critical. How we rate them

Cars that each one is fitted to

2.0 CDI (OM640)

2.0/2.2 D-4D

See the 9 models with the 2.0/2.2 D-4D

Other comparisons

With the 2.0 CDI (OM640)

With the 2.0/2.2 D-4D

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Sources

Every fact on this page links to its source. If you find an error, let us know.

Mercedes-Benz OM 640Wikipedia (alemán) · Other source · consulted 27 September 2026 · in German
Mercedes A-Klasse (W169) – Typische Probleme & SchwachstellenGebrauchtwagenberater · Motoring press · consulted 27 September 2026 · in German
Fiabilité des 180d / 180 CDI MercedesFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Fiabilité 200 CDI MercedesFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Toyota Avensis (2003-2009) : fiabilité, pannes et rappelsFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Toyota Avensis (2008-2018) : fiabilité, pannes et rappelsFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Toyota RAV4 (2006-2012) : fiabilité, pannes et rappelsFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Toyota RAV4 (2013-2019) : fiabilité, pannes et rappelsFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Mercedes-Benz OM640 engineWikipedia · Other source · consulted 27 September 2026
Mercedes-Benz W169Wikipedia (alemán) · Other source · consulted 27 September 2026 · in German
Mercedes-Benz W245Wikipedia (alemán) · Other source · consulted 27 September 2026 · in German
Toyota AD engineWikipedia · Other source · consulted 27 September 2026
Toyota AvensisWikipedia · Other source · consulted 27 September 2026
Toyota AvensisWikipedia (alemán) · Other source · consulted 27 September 2026 · in German
Toyota AurisWikipedia · Other source · consulted 27 September 2026
Toyota VersoWikipedia · Other source · consulted 27 September 2026
Toyota Auris (2007-2012) : fiabilité, pannes et rappelsFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Toyota Corolla Verso : fiabilité, pannes et rappelsFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French
Toyota Verso : fiabilité, pannes et rappelsFiches-auto.fr · Motoring press · consulted 27 September 2026 · in French